Malicious PDF — malware analysis report

Static analysis result for SHA-256 870adb618ea2b012…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 11:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 566d4f95b88a27115724f27becb8adde SHA-1: e0d647d90a0dba334f848fcfad8f1a6e31e54ad7 SHA-256: 870adb618ea2b0123295ff44331864c9720621d1bdc071187b26afc4fb9bb430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=do+hackers+use+kali+linux PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/69c04d5c3b9fd52916a333eaeb13ef88/roluloradidudorofa.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/75283868461.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/28622212978.pdfIn PDF document text
    • https://riwg.in/userfiles/file/radimi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/bilogibatigivikupudora.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/35499311253.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n7g73o4j58me625iv7ikcpeqhe/pobubutubawikalumalo.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/xenidu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622183585.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/15f135b4b4241c5c914922eeab35a8af/44635547718.pdfIn PDF document text
    • https://memoservicesrl.it/file/wezasere.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/kafel.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/rizopeliz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607031dd6e266---bumowobodowitu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/bigoji.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d89579f3836ccebb0699a1376ddd5e16/80216398048.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/51688858483.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/262ae303d3ac891f00a3c36aa03632b5/96623852680.pdfIn PDF document text
    • http://regmac.net/userfiles/files/57110574062.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/muwulojazale.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fef4a734b9f5070023744f35dbeb97c0/11277283297.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36460bae5b---67967605781.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/deloxokuvixosuda.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afab666ed9d---58356583693.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/tiwusigozitagowimixexiki.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 17208 bytes
SHA-256: c3d429462b9db2355bb0153aa4978babd643b4dc39aaeda3e58528f0735b1320
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 10524 bytes
SHA-256: f3816afabd320cd0f7acfd48024e3864dd88eff1678e98d08ccc6fa2617e106f
font_02_sfnt_off000136b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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